Screening or separating machine.



T. J. STURTEVANT. SCREENING QR SEPA RATING MACHINE.

Patented June 12, 191?.

W m APPLICATION FILED DEC. I2 1916- 2 SHEETs-s EET T; J. STURTEVANT.

SCREENING-0R SEPARATING MACHINE. Y APPLICATION FILED uscflz, 1915.

1 fi l 1 a Patented June 12, 1917.

2 SHEETS-SHEET 2.

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THOMAS JOSEPH STURTEVANT, OF WELLESLEY, MASSACHUSETTS, ASSIGNOE TO STURTEVANT MILL COMPANY, A CORPORATION OF MAINE.

scnnnnme on snrnna'rmo MACHINE.

Patented June 12, 191W.

Application filed December 12, 1916. Serial No. 136,420.

To all whom it may concern:

Be it known that I, THOMAS J. STURTE- VANT, a citizen of the United States, residing at Wellesley, in the county of Norfolk and State of Massachusetts, have invented or discovered certain new and useful Improvements in Screening or Separating Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain improvements in that class of inclined vibrating screening machines or separators in which the screens are percussively j arred when the machines are inoperation, as, for example, in the machines of the Sturtevant Patents Nos. 1,035,262 and 1,114,064. Machines of this kind are usually provided with upper, coarse or scalping screens and lower fine mesh screens, which latter, to enable them to perform their operation most efliciently, are percussivelyjarred, as are also sometimes the former.

The present invention relates to certain improved means for mounting and supporting the screen clothing and screens in the screen boxes or casings, as will hereinafter be fully set forth.

In the accompanying drawing Figure 1 is a cross section of a screen box or casing provided with screening members which are mounted therein in accordance with the present invention. Fig. 2 is a similar view showing a slightly different embodiment of the invention from that shown in Fig. 1. Fig.3 is a plan view illustrating the form of the invention shown in Fig. 1.

Referring to the drawing, 12 denotes a screen box or casing to the inner side walls of which are permanently attached supports 13 which extend longitudinally of the casing, so as to run up and down, these sup-.

ports 13 being preferably of sheet steel bent into angular form in cross section, as shown. These supports 13 carry at the lower ends of "their depending portions angle bars 14 which are preferably provided at their under sides with grooves 15. Suspended from the horizontal portions ofthe supports 13, by

bolts 16 are'angle bars 17 to which are rivet-' ed vertical plates 18 provided at their lower ends with permanently attached angle bars 19 the horizontal portions of which are pref- .erably provided with ribs 20 extending into the grooves 1 5 of the angle bars 14.

the screen clothing is effected by turning the nuts 22 on the bolts 16 so as to lift the plates 18 and angle bars 19, and thus bring the clamping jaws afforded by the horizon- 'tal portions of the angle bars 14 and 19 firmly together. Owing to the fact that this fine mesh screen clothingruns over the ribs 20 on the angle bars 19, and which ribs extend into the grooves 15 in the angle bars 14, the screen clothing will be efl'ectively gripped, by these parts so as to be held securely in place.

This fine mesh screen clothing 21 may be a stretched, so as to be drawn properly taut, by turning the nuts 23 on the bolts 24 mounted in the casing 12 and passing through the depending portions of the an le bars 13 and which depending portions are sufnciently resilient so that they may be sprung outward toward the sides of the casing '12 to stretch the screen clothing 21 and hold the same taut.

v The wire mesh screen clothing is preferably provided, above and below, with protecting plates 25 riveted to said screen clothing; and superposed on said protecting plates are sockets 26 receiving the lower ends of'the impact bars 27 on which hammers strike at intervals, as in the machines of the Sturtevant patents hereinbefore referred to, for the purpose of vibrating the screen clothing. These protecting plates, in the form of the invention herein shown, are of less length than the width of the screen clothing 21, so that said screen clothing is free to be vibrated by the impact bars and their operating hammers.

To properly sustain the screen clothing 21 under the impact of the jarring operations, longitudinal supports 28, consisting preferably of steel rods or wires arranged beneath the sockets 26, are preferably provided; these rods or wires being sufficiently elastic, and being yieldingly supported on the screen casing by coil springs'37, to enable the jarthe cover 34 of the screen casing ring operation to be properly effected, While serving to prevent such. displacement of the screen clothing as would be liable to tear or injure it. The springs 37 are held in place by nuts 38 on screw-threaded end portions of the rods 28.

The coarse or scalper screen 29, mounted in the screen casing above the fine wire mesh screen clothing 21, is, in the form of the invention herein shown permanently attached to a frame the sides of which consist of angle bars 30 resting on the horizontal parts of the angle-bar supports 13, this coarse wire mesh screen clothing being preferably clamped between said angle bars 30 and elastic sheetmetal plates or strips 31 which bear against the sides of the inner walls of the screen casing 12 in such a manner as to prevent the material being screened from passing over the side edges of the parts 30 and 31, at the sides of the scalper screen. Mounted on this coarse or scalper screen are guides 32 through which-the impact bars 27 loosely pass, said impact bars being steadied near their upper ends by guides 33 mounted on 12. From this it will be understood that the scalper screen 29, with its frame parts 30 and 31, may be removed from the screen casing when the said cover of the screen casing is lifted.

In the form of the invention shown in Fig. 2 the constructions of all of the parts are the same as in Figs. 1 and 3, excepting that the elastic supports for the fine Wire mesh screen 21 are differently arranged. In this construction shown in Fig. 2' transverse supporting rods or wires 28 are provided, these rods passing through brackets 35 arranged below the sockets 26 and attached, as are also said sockets, to said fine wire mesh screen clothing. These supporting rods 28*, which, like the rods 28, are in the vertical planes of the impact bars 27 are preferably of steel, extend loosely through bosses 36 attached to the sides of the screen casing 12, and each is encircled at one end by a coil spring-37 arranged between the outer end of one of said bosses and a nut 38 on a screw-threaded end portion of the rod.

The rods 28, shown in cross section in Fig. 1, will preferably be mounted in the screen casing 12 in a manner similar to that shown 'for' the mounting of the rods 28.

These rods 28 are referred to in the pluralfor the reason that it will be understood that I one. of these rods will be providedfor each I Sturtevant patents hereinbefore referred to.

It will be understood that the parts here'- inbefore described which removably hold the fine-mesh'wire screen clothing 21, and bywhich said screen clothing may be properly stretched, constitute built-in parts of the separator casing, so as to be permanent or non-removable elements, in oontradistinction to a removable screen frame like that of the coarse or scalper screen member herein 1 shown and described.

As hereinbefore stated, the depending portions of the angle bars 13, which are preferably of sheet steel, are resilient, and the casing 12 is also preferably of more or less resilient sheet steel; so that the removably mounted fine wire mesh clothing is elastically supported at or near its edges, as well as by the resilient supporting rods 28 and 28 beneath, and is thus so yieldingly.

the coarse or scalper screens of separating machines.

The invention is not to be understood as being hereln shown and described, as such details may be varied widely, within'the province of mechanical skill, without departing from the scope of the invention as defined in the appended claims.

Having thus described my invention I claim and desire to secure by Letters Patent: 1. In a vibrating separator, the combination with a screen casing, ofsupports at- -:tached to said casing, clamping means sustained by said supports, and wire mesh screen clothing removably held near its edges by said clamping means, said screen clothing being provided with protecting plates of lesser length than its width.

2. In a vibrating separator, the combination with a screen casing, of supports attached thereto, clamping means, sustained by said supports, for removably holding fine wire mesh screen clothing, and a coarse or scalper screen having at its edges frame parts removably sustained by said supports.

3. In a vibrating separator, the. combination with a screen casing, ofsupports attached thereto, clamping means, sustained by said supports, for removably holding fine wire mesh screen clothing, means for stretch- ..ing said screen clothing, and a coarse or scalper screen having at its edges frame parts removablysustained by said supports. 4. In a vibrating separator, the combina limited to the details of construction.

tion with a screen casing, of supports at tached to the sides thereof and having depending. vresilient parts, lower clamping members sustained by said supports, wire. mesh screen clothing havingits edges extended between said clamping members, and means, sustained by said supports, for bodily adjusting said lower clamping members vertically for gripping and releasing the edges of said wire mesh screen clothing.

5. In a vibrating separator, the combination with a screen casing, of supports attached to the sides thereof and having de pending resilient parts, upper clamping members attached to said depending parts, lower clamping members sustained by said supports, wire mesh screen clothing having its edges extended between said clamping members, and means, sustained by said supports, for bodily adjusting said lower clamping members vertically for gripping and releasing the edges of said wire mesh screen clothing, one of each pair of said clamping members being provided with a groove, and the other of each pair of said clamping members being provided with a rib extending into said groove.

6. In a vibratingseparator, the combination with a screen casing, of supports attached to the sides thereof and having depending resilient parts,upper clampingmembers attached to said depending parts, lower clamping members sustained by said supports, wire mesh screen clothing having its edges extended between said clamping members, means, sustained by said supports, for bodily adjusting said lower clamping members vertically for gripping and releasing the edges of said wire mesh screen clothing, and bolts passing through said screen casing and provided with nuts for springing said depending resilient parts of said supports, for stretching said screen clothing.

7. In a vibrating separator, the combination with a screen casing, of supports attached to the sides thereof and having depending resilient parts, upper clamping members attached to said depending parts, .lower clamping members sustained by said supports, wire mesh screen clothing having its edges extended between said clamping members, means, sustained by said supports,

I for bodily adjusting said lower clamping members vertically for gripping and releasing the edges of said wire mesh screen clothing, one of each pair of said clamping members being provided with a groove, and the other of each pair of said clamping members being provided with a rib extending into said groove, and bolts passing through said screen casing and provided with nuts for springing said depending resilient parts of said supports, for stretching said screen clothing.

8. In a vibrating separator, the combina tion with a screen casing, of supports attached to the sides thereof and having depending resilient parts, upper clamping members attached to' said depending parts, lower clamping members cooperating with .lower clamping members coiiperatin said upper clamping members, and vertically adjustable bolts having screwthreaded portions provided with nuts, and from which bolts said lower clamping members are supported, sothat said lower clamping members may be adjusted vertically bodily by turning said nuts, and wire-mesh screen clothing removably held by said clamping members.

9. In a vibrating separator, the combination with a screen casing, of supports attached to the sides thereof and having de pending resilient parts, upper clamping members attached to said depending parts, lower clamping members cooperating with said upper clamping members, vertically adjustable bolts having screw-threaded portions provided with nuts, plates supported from said bolts and lower clamping members attached to said plates, so that said lower clamping members may be adjusted vertically bodily by turning said nuts, and wire-mesh screen clothing removably held by said clamping members.

10. In a vibrating separator, the combination with a screen casing, of supports attached to the sides thereof and having depending resilient parts, upper clamping members attached to said depending parts, lower clamping members cooperating with said upper clamping members, verticallyqadjustable bolts having screw-threaded portions provided with nuts, and from which bolts said lower clamping members are supported, so that said lower clamping members may be adjusted vertically bodily by turning said nuts, wire-mesh screen clothing removably held by said clamping members, and means for springing said resilient parts of said supports for stretching said screen clothing.

11. In a vibrating separator, the combination with a screen casing, of supports attached to the sides thereof and having depending resilient parts, upper clamping members attached to said depending part? wit said upper clamping members, vertica ly adjustable bolts having screw-threaded portionsprovided with nuts, plates supported from said bolts, lower clamping members attached to said plates, so that said lower clamping members may be adjusted vertically bodily by turning said nuts, wiremesh screen clothing removably held by said clamping members, and means for springing said resilient parts of said supports for stretching said screen clothing.

12. In a vibrating separator, the combination'with a screen casing, of resilient supports attached to said casing, clamping means sustained by said supports, wire mesh stretched screen clothing held near its edges by said clamping means, impact devices for jarring said screen clothing, and, 36

elastic rods extending beneath said impact devices and screen clothing, and yieldingly mounted in said casing, such yielding mountings serving to add to the resiliency of said rods and said stretched clothing.

13. In a vibrating separator, the combination with a screen casing, of supports at tached to said casing, clamping means sus tained by said supports, wire mesh screen clothing removably held at its edges by said clamping means, impact devices for vibrat- 1n said wire mesh screen clothing, elastic rods yieldinglymounted in said casing and arranged beneath said screen clothing and in the vertical plane of said impact devices.

In testimony whereof I aflix my signature.

THOMAS JOSEPH STURTEVANT. 

